The automobile model calculates the carbon footprint of a passenger vehicle over a specific period of time. Users supply information about the vehicle and driving patterns, and the model computes a standards-compliant carbon score based on EPA and EIA data. The current version supports 11 fuel types, 18 automobile size classes, and 26,809 vehicle variants. As with all our models, the currency of these supporting data is ensured by automated daily imports that link our servers to the original government sources.

Impact scope The automobile emission estimate is the total anthropogenic emissions from fuel and air conditioning used by the automobile during the timeframe. It includes CO2 emissions from combustion of non-biogenic fuel, CH4 and N2O emissions from combustion of all fuel, and fugitive HFC emissions from air conditioning. For vehicles powered by grid electricity it includes the emissions from generating that electricity.